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jimthompson5910 (jim_thompson5910):
Start with the graph of y = -x^2
You graph the full curve, but then you erase the portion that's to the right of x = 1. This is because you are only graphing y = -x^2 when x < 1
jimthompson5910 (jim_thompson5910):
You will have an open circle at the endpoint of y = -x^2 when x = 1
The same will be done with the second piece of y = 2x but when \(\large x \ge 1\)
jimthompson5910 (jim_thompson5910):
graph the full line y = 2x
then erase the part thats to the left of x = 1. This is because y = 2x is only graphed when \(\large x \ge 1\)
There will be a closed circle at the endpoint of this piece
jimthompson5910 (jim_thompson5910):
you could if you wanted to, yes
jimthompson5910 (jim_thompson5910):
pick any number you want
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jimthompson5910 (jim_thompson5910):
tell me what you pick
jimthompson5910 (jim_thompson5910):
which inequality does that satisfy
x < 1
OR
\(\large x \ge 1\)
jimthompson5910 (jim_thompson5910):
so we plug x = 1 into the second piece, since x = 1 satisfies the second inequality
jimthompson5910 (jim_thompson5910):
y = 2x
y = 2*1
y = 2
jimthompson5910 (jim_thompson5910):
You'll have a row of: 1 2
in the table
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jimthompson5910 (jim_thompson5910):
pick another number
jimthompson5910 (jim_thompson5910):
which inequality does it satisfy now?
jimthompson5910 (jim_thompson5910):
so you plug that into the first piece
y = -x^2
y = -(0)^2
y = 0
you'll have the row: 0 0
jimthompson5910 (jim_thompson5910):
let's say you picked -3
that satisfies the first inequality, so,
y = -x^2
y = -(-3)^2
y = -9
giving you the row: -3 -9
jimthompson5910 (jim_thompson5910):
you can keep repeating these steps until your table is as big as you want
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